Boiler



M. F. MOORE BOILER Filed March 4, 192'? OOO Patented Feb. 19, 1929.

UNITED STATES PATENT OFFICE.

MICHAEL F. MOORE, 0F KEWANEE, ILLINOIS, AS'SIGNOR, BY MESNE ASSIGNMENTS, TO KEWANEE BOILER CORPORATION, 0F KEWANEE, ILLINOIS, A 'CORPORATION 0I'` DELAWARE. l

BOILER.

Application mea March 4, 1927. serial no. 172,577.

My invention pertains to certain features of novelty and advanta e, both structural and functional, in steamoilers and similar appliances and it aims particularly to increase the efficiency of operation of the boiler with resulting possibility of reduction in size of the boiler of a given steam-generating capacity with consequent lesser cost of production.

Heretofore, owing to the necessity of. using stay-bolts connecting the outer shell of the boiler' and the crown-sheet thereof to properly support and strengthen the latter, it has been necessary to so arrange an space the fire-tubes above the crown-sheet as to avoid such bolts, the tubes were not disposedl to maximum advantage from an economy viewpoint with respect, to the combustion of the fuel consumed in the fire-box.

In this new and improved structure the crownesheet is so made that it does not require the objectionable stay-bolts to sustain and stiften it, and, accordingly, a new and better arrangement of the fire-tubes is made possible, thereby giving the boiler greater steam-generating properties and allowing a .V

better and more effective fiow of water around and between the tubes.

To enable those skilled in this art to have a full and complete understanding of the invention, I have illustrated two desirable embodiments thereof in the accompanying sheet of drawings, forming a part of this i specification and throughout the views of' which like reference numerals have been employed to designate the same parts.

In this drawing z- Figure 1 is a central, vertical, longitudinal section through one form of the boiler incorporating the invention;

Figure 2 is a vertical crosssection thereof on line 2-2 of Figure 1, the parts being viewed in the direction indicated by the arf rows; and

Figure 3 is a fragmentary view similar to that of Figure 2, illustrating a modified arrangement of the tubes above the crownsheet.

By reference first to the construction presented in Figures 1 and 2, it will be perceived that boiler has a fire-box 11 with a hollow, front wall 12 having a door-opening 13, the door not being shown, hollow sidewalls or legs 14, 14 and a rear wall le the the result being that lower portion 16 of which is hollow as is clearly depicted. v

The metalheets forming such hollow Walls are securely and adequately tied together by stay-bolts or rivets, as shown, and

the spaces in such walls are filled with the water of the boiler, whereby to obtain heating efciency for the structure and to secure proper protection for the metal of such walls from the heat ofthe fire present in the combustion-chamber.

The top wall of the fire-box 11 comprises a transversely corrugated or ribbed, upward-v d ly-arched, metal crown-sheet 17, the undulations or hollow ribs of which are of such size, number and arrangement that the sheet needsno supporting and strengthening staybolts above it, this element being sufficiently strong and stiff to satisfactorily withstand all strains and stresses to which it may be subjected and especially those resulting from the steam pressure in the boiler.

Furthermore, the wavy conformation of the sheet materially increases its area of heating contact with the water in the boiler directly above it.

The principal advantage, however, accruing from such construction is the absence of stay-bolts, diagonal, inclined, or upright, above the sheet thus allowing a most favorable disposition of the tire-tubes, about to be described.

It may be noted, however, that a small number of horizontal tie-rods or cross-stays 18, 18 connect together the opposite walls of the cylindrical boiler-shell 19 by means of securing brackets 21, 21, such cross elements being positioned immediately above and close to the crown-sheet, being located, at least in part, in the transverse channels or depressions of the plate between the ribs forming the corrugations, whereby they in no way interfere or confiict with the desired economical arrangement of the fire-tubes.

The single-thickness, sheet-metal, back'- wall, plate 15 of the combustion chamber 11 is connected by a plurality of horizontal fire or gas tubes or pipes 22, 22', with the sheet-metal rear wall 23 oi the boiler proper, such tubes, as is usual, occupying apertures in both plates and being expanded and secured thereinin the customary manner, thus affording multiple, parallel fiues for the passage of the hot combustion gases from the upper portion of the fire-box into the lower part of the connecting chamber or compartment 24 at the back ofthe boiler.

A series of longer fire tubes or pipes 25, connect the upper section of chamber 24 with a compartment 26 at the front of the boiler and having stack or chimney connection 27 which, in general, is an ordinary construction, but, in this instance, owing to the absence or elimination of obstructing stay-bolts, a greater number of such tubes may be used in the same space and they wardly through the tubes 22, upwardly in the chamber or flue 24, and forwardly through the tubes or pipes 25 into the compartment 26, leaving the latter for the stack.

In the species shown in `Figuresl and 2, lthe tubes or ipes 25 are uniformly spaced and arrangerl being in vertical staggered relation, which disposition o'f such elements has distinct advantages, but, in `some instances, it is preferred to position such conduits or lues in horizontal and vertical rows, to facilitate the upward water flow around them, and, such a construction is presented in Figure 3, wherein the tubes referred to have zbeen characterized 125,' the two structures being otherwise alike.

Thus the new constructions may be made smaller than has heretofore been possible and still have the same capacity or power for producing steam, the corrugated, stiffened crown-sheet having greater area vof heating contact with the water and also allowing more and better disposed fire-tubes to beemployed, these combined features resulting in a furnace or boiler of practical improvement over those manufactured in the ast. v

T ose trained in this industry will readily understand that many minor mechanical changes may be incorporated in the structures presented without departurefrom the heart and essence of the invention, as defined by the appended claims, and without the loss or sacrifice of any of its material and substantial benefits and advantages.

I claim:

l. A fire-tube boiler having in combination a tire-box having stayed upright sidewalls and an unstayed transversely corrugated crown-sheet of sufficient strength in itself to withstand the strains to which it is subjected and of a relatively fiat curvature substantiallyless than semicircular and a plurality of uniformly arranged fire-tubes equally spaced apart above said crown-sheet.

2. A lire-tube boiler havingin combination a ire-box having stayed upright sidewalls and an unstayed transversely-corrugated crown-sheet of sufficient strengthy in itself to withstand the strains to which it is subjected and of a relatively flat curva-- ture substantially less than semicircular, cross-stays connected to opposite .walls of the boiler-shell occupying at least in part the transverse depressions of said crownsheet, and a plurality of lire-tubes above said crown-sheet uniformly spaced apart equal distances.

In witness whereof I have hereunto set my hand.

MICHAEL F. MOORE. 

